Detailed Product Description Mine welded pipe conveying fluid(1) Standard: GB/T 14291-1992(2) Materials: ... in mine air pressure, drainage, gas discharge axis with straight seam welded steel pipe As a large conglomerate company,we also supply an ... of steels, such as" angles, flat steel, square steel, welded pipe, galvanized pipe, steel mill, hot-rolled steel, I-steel, channel steel, wire ...